Makita DBM230 Betriebsanleitung Seite 27

After you have finished drilling:
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Removal of the bore core, in case it is stuck in the drill bit.
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Removal of the bore core in a blind hole
Break off the core with a wedge or a lever. Remove the core with suitable pliers
or drill a hole into the core, insert a lifting screw and pull the core out.
Repairs may only be performed by qualified, trained and experienced personnel.
After each repair the tool must be inspected by an electrical specialist.
Due to its design, the tool needs only a minimum of care and maintenance.
Nevertheless the following rules should be observed:
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Switches, cable and plug must be inspected regularly by an electrical specialist.
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After drilling
Remove the drill bit from the borehole.
Switch the motor off. Use the motor switch and not the GFCI for this
purpose.
Close the water supply.
Remove the drill bit from the motor.
Put the drill bit in an vertical position.
Slightly tap with the wooden handle of a hammer against the tube until
the bore core slides out. Never knock the drill bit forcefully against a wall
or treat it with tools like hammers or wrenches, the tube may become
deformed so that neither the bore core will loosen nor the drill bit may be
used again.
Maintenance and Care
Before doing any work on the machine, pull the mains plug!
Clean the core drill unit after finishing the drilling. Afterwards grease the
thread of the drill spindle. The air vents must always be open and clean.
Take care that while cleaning the tool no water enters into the core drill
tool.
After the first 150 operating hours the transmission oil must be
exchanged. The oil exchange will greatly increase the life cycle of the
transmission.
After approx. 200 operating hours the carbon brushes must be inspected
by an electrical specialist and replaced if necessary (only use original
carbon brushes).
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